<!-- 员工导入对话框 -->
<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input
          ref="inputRef"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="uploadExcel"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="importExcel">下载导入模板</el-button>

          <span>将文件拖到此处或
            <el-button type="text" @click="updateExcel">点击上传</el-button>

          </span>

        </div>

      </div>

    </el-row>

    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>

    </el-row>

  </el-dialog>

</template>

<script>
import { importExcelAPI, uploadExcelAPI } from '@/api/employee'
import { saveAs } from 'file-saver'

export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    // 下载导入模板
    async importExcel() {
      /* 后端返回的格式
      Blob {size: 17955, type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'}
      "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
      */
      // 直接调用接口, 拿到数据, 使用saveAs下载文件
      const res = await importExcelAPI()
      saveAs(res, '员工导入模板.xlsx')
    },
    // 点击上传按钮
    updateExcel() {
      // 调用input上传文件类型的click方法
      this.$refs.inputRef.click()
    },
    // 1.上传文件-导入Excel文件
    async uploadExcel(e) {
      try {
        // console.log('e.target.files  ----->  ', e.target.files) // 文件对象
        // console.log('e.target.value  ----->  ', e.target.value) // 文件路径

        // 1.2 通过e.target去找文件
        if (e.target.files.length === 0) return
        const formData = new FormData()
        formData.append('file', e.target.files[0]) // 1.3FormData 把文件追加到FormData对象这两个
        await uploadExcelAPI(formData) // 1.4批量导入文件接口
        this.$emit('update:showExcelDialog', false)
        this.$message.success('导入成功')
      } catch (error) {
        console.log(error)
      } finally {
        // 1.5因为用的change事件, 所以上传完文件后, 要将input的value(文件路径)值清空,
        // 不然下次上传时, change事件不会触发(因为文件路径没变, 所以不会触发change事件)
        this.$refs.inputRef.value = ''
      }
    }

  }
}
</script>

      <style scoped lang="scss">
      .upload-excel {
      display: flex;
      justify-content: center;
      margin: 20px;
      width: 360px;
      height: 180px;
      align-items: center;
      color: #697086;
      .excel-upload-input {
        display: none;
        z-index: -9999;
      }
      .btn-upload,
        .drop {
        border: 1px dashed #dcdfe6;
        width: 100%;
        height: 100%;
        text-align: center;
        line-height: 160px;
        border-radius: 8px;
        display: flex;
        flex-direction: column;
        justify-content: center;
      }
      .drop {
        line-height: 40px;
        color: #bbb;
        i {
          font-size: 60px;
          display: block;
          color: #c0c4cc;
        }
      }
    }
  </style>
